PDOStatement::getColumnMeta

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Beschreibung

mixed PDOStatement::getColumnMeta ( int column )

Warnung

Diese Funktion ist EXPERIMENTELL. Das Verhalten, der Funktionsname und alles Andere was hier dokumentiert ist, kann sich in zukünftigen PHP-Versionen ohne Ankündigung ändern. Seien Sie gewarnt und verwenden Sie diese Funktion auf eigenes Risiko.

Retrieves the metadata for a 0-indexed column in a result set as an associative array.

Warnung

Not all PDO drivers support PDOStatement::getColumnMeta().

Parameter Liste

column: The 0-indexed column in the result set.

Rückgabewerte

Returns an associative array containing the following values representing the metadata for a single column:

Tabelle 1. Column metadata

Name	Value
`native_type`	The PHP native type used to represent the column value.
`driver:decl_type`	The SQL type used to represent the column value in the database. If the column in the result set is the result of a function, this value is not returned by PDOStatement::getColumnMeta().
`flags`	Any flags set for this column.
`name`	The name of this column as returned by the database.
`len`	The length of this column. Normally `-1` for types other than floating point decimals.
`precision`	The numeric precision of this column. Normally `0` for types other than floating point decimals.
`pdo_type`	The type of this column as represented by the `PDO_PARAM_*` constants.

Returns FALSE if the requested column does not exist in the result set, or if no result set exists.

Beispiele

Beispiel 1. Retrieving column metadata
The following example shows the results of retrieving the metadata for a single column generated by a function (COUNT) in a PDO_SQLITE driver.
<?php $select = $DB->query('SELECT COUNT(*) FROM fruit'); $meta = $select->getColumnMeta(0); var_dump($meta); ?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
array(6) { ["native_type"]=> string(7) "integer" ["flags"]=> array(0) { } ["name"]=> string(8) "COUNT(*)" ["len"]=> int(-1) ["precision"]=> int(0) ["pdo_type"]=> int(2) }

Siehe auch

PDOStatement::columnCount()

PDOStatement::rowCount()

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